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From "Shixiong Zhu (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-22230) agg(last('attr)) gives weird results for streaming
Date Tue, 10 Oct 2017 00:05:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-22230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shixiong Zhu resolved SPARK-22230.
----------------------------------
    Resolution: Fixed

> agg(last('attr)) gives weird results for streaming
> --------------------------------------------------
>
>                 Key: SPARK-22230
>                 URL: https://issues.apache.org/jira/browse/SPARK-22230
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.2.0
>            Reporter: Jose Torres
>            Priority: Minor
>             Fix For: 2.3.0
>
>
> In stream aggregation, last('attr) yields the last value from the first microbatch forever.
I'm not sure if it's fair to call this a correctness bug, since last doesn't have strong correctness
semantics, but ignoring all rows past the first microbatch is at least weird.
> Simple repro in StreamingAggregationSuite:
>     val input = MemoryStream[Int]
>     val aggregated = input.toDF().agg(last('value))
>     testStream(aggregated, OutputMode.Complete())(
>       AddData(input, 1, 2, 3),
>       CheckLastBatch(3),
>       AddData(input, 4, 5, 6),
>       CheckLastBatch(6) // actually yields 3 again



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